Wood-pulp and process for making same.



G. BAGHE-WI'TG.

woon PULP AND rnoonss ron mums am. AP'PLIOATIOI PILED KAY 18. 1907.

913,679. "Patented Mar.2,1909.

I I I I ii .1, I, A

[I i 6 i 6 J m.. a 4 8 {II 10 l Witnesses fizz/6222.071

CARL BAoHE-wuor, OFBERLIN, NEW Hansen-IRE.

WOOD-PULP AND PROCESS FOR MAKING am.

Specification of Letters Patent.

Patented a, race.

Application filed lay 18, 1907. Serial No. 878,986.

To all whom it may concern:

Be it known that I, CARL BAonE-Wi're, of Berlin, county of Coos, State of New Hampshire, have invented an Im rovement 1n Wood-Pulp and Processes for aking Same, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawin s representing like parts.

his invention relates to a'process for treating wood for the production of a white ground wood pulp for paper, and also to a new form of wood pulp which can be used without the admixture with it of any sulfite, and newsgaaper of'a good quality produced, or it may e used as a mixer in strong wrappinlg paper, Manila paper or bag paper.

\ y process consists in cooking the wood in the form of blocks in a suitable solution which operates to soften but not to dissolve and thereby remove to any substantial extent, the hgnin which is contained in the outer portions of the blocks, and by softening the li in to separate the fibers of the wood; an then grinding the blocks thus treated, in the usual manner. When the blocks are ground the fibers obtained from the outer treated portions of the blocks are stronger and longer than the fibers obtained from the inner-untreated portions of the blocks, and substantially all the 1 lignin which is contained in the blocks is resent in the yield. As for example, a cor of wood\ will yield say 2000 pounds of ground wood pulp in the ordina manner, while by my process the yield w' pounds, the loss being sequential wh'encom ared with t e superior qualit of the v.ulp w 'ch is reduced. The pulp t us pro uced is well a apted as a sub stitute for a mixture of ground wood and sulfite.

In practicing my invention I em loy a saline solution, usm sodium chlor1d and water in the pre aration of this solution, and

therefore uite inconit may be ma e of any degree of concen-.

tration. This solution possesses certain advantages which' are very important, as-for instance it acts readily 'to soften the li 'n and not to dissolve it to any substantia extent, even when heated to a high temperature, (as for instance, to 120 C.) so that the bulk or volume of the yield will not be substantially reduced; also, it does not discolor the woodor cause any discoloration of the creasing the cost of be approximately 1900 ab'le means, such as a puinp or gravity,

I wood even when heated to a ture, (say to 120 0.), but -on--t e-centrary whitens it some.

Furthermore, the sdhrfion maybe reused by merely 'adding*'sotl'ium' chloridand water to maintainthereqnired strength and quantity. My invention ever, is not limited to the use of this'solutien as other solutions may be suited-for "the purpose, the'object being to em lo; aeoliation which will soften but not 'ssdlvethe lignin, I am familiar with the ordinary sulfite and soda processes and Iam aware that wood has been treated with chemical solutions which act to remove the lignin, as

for instance, it has been treated with an alkaline solution which softens the wood but also dissolves the lignin and discolors the pul but I am not aware of any process b whichsubstantiall all the lignin is retaine it being merely so tened sufficiently'to cause the separation of the fibers of the wood in order that comparativel long fibers may be obtained when the wood 1s ground. fore, disclaim the use of al aline solution.

I find in practice that when the blocks are treated in accordance with my process the power required to grind up the blocks is materially reduced, which results in de- The term lignin is herein used in the broad or general sense, meaning all the'binding and other substances associated with the cellu- 'lose in the wood.

In the drawing herewith, I have shown a suitable di ester for practicing my process. This is ma e of either steel or cast iron, and may be stationary. or rotary and arranged either horizontally or vertically. The gester may be lined with brick or similar material to resist the action of the chemicals. After the digester is charged with the blocks, the liquor 'may be introduced by any $111,113;

u I prefer to use a vacuum pum ii' because thereby the air is drawn from t e blocks, permittin the liquor to penetrate the blocks more deep y, or in a shorter time.- It will be understood that the time of the cooking and the strength of the solution do end on the quality of ulpmdesired and t e depth to which the b oc are to be treated.

' In the drawing 1 indicates the digester having a remojva a cover 2 secured in position by nuts and bolts-3 why other suitable means, 'and having a removable bottom 4 I, thereproducing the pulp.-

Correction in Letters Patent No. 913.679.

secured in position by other suitable means.

7 is a ipe leading to a suitable vacuum pump, w en it is desired to introduce the 'quor by that means.

8, 8 are inlet and outlet pipes for the liquor. Steam for cooking may be introduced through a suitable pipe 9. The digester may desirably be supported on brackets as 6, 6, or otherwise, and the bottom held up in position by means of a hydraulic,

or other, press 10, whereby the d1 ester is conveniently charged and t e cooke blocks convenientl removed. 7

Having t us described my patent, what I claim as new and desire to secure by Letters Patent is 1. The herein described process of preparing wood pulp for plaper which consists in treating the wood in t e form of blocks with for Making Same,

[sun] It is hereby certified that the name of the patentee in Letters Patent No.

whereas said name should have been written and printed as Carl Bache Wi'iy,-

by nuts and bolts 5,- 0r I a solution of sodium chlorid to soften only but not remove the hgnin contained in the outer portionsthereof, to a substantial depth, to thereby separate the fibers and then rinding up the entire blocks.

2. Vood pulp for aper composed of untreated fibers mixe with treated fibers treated with a solution of sodium chlorid and containinglsubstantiall all the lignin which is origina y containe in the wood from which both fibers are obtained, substantially as described.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

CARL BACHE-WUG.

Witnesses:

B. J. N OYES, H. B. DAVIS.

913,679,: granted March 2,1909, for an improvement in Wood-Pulp an dProeesses was erroneously written and printed as Carl Bache-Wl'ig,

and

that the-said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 3rd day of July, A. D., 1917.

F. W. H. CLAY, Acting Commissioner of Patents.

Correction in Letters Patent No. 913.679.

secured in position by other suitable means.

7 is a ipe leading to a suitable vacuum pump, w en it is desired to introduce the 'quor by that means.

8, 8 are inlet and outlet pipes for the liquor. Steam for cooking may be introduced through a suitable pipe 9. The digester may desirably be supported on brackets as 6, 6, or otherwise, and the bottom held up in position by means of a hydraulic,

or other, press 10, whereby the d1 ester is conveniently charged and t e cooke blocks convenientl removed. 7

Having t us described my patent, what I claim as new and desire to secure by Letters Patent is 1. The herein described process of preparing wood pulp for plaper which consists in treating the wood in t e form of blocks with for Making Same,

[sun] It is hereby certified that the name of the patentee in Letters Patent No.

whereas said name should have been written and printed as Carl Bache Wi'iy,-

by nuts and bolts 5,- 0r I a solution of sodium chlorid to soften only but not remove the hgnin contained in the outer portionsthereof, to a substantial depth, to thereby separate the fibers and then rinding up the entire blocks.

2. Vood pulp for aper composed of untreated fibers mixe with treated fibers treated with a solution of sodium chlorid and containinglsubstantiall all the lignin which is origina y containe in the wood from which both fibers are obtained, substantially as described.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

CARL BACHE-WUG.

Witnesses:

B. J. N OYES, H. B. DAVIS.

913,679,: granted March 2,1909, for an improvement in Wood-Pulp an dProeesses was erroneously written and printed as Carl Bache-Wl'ig,

and

that the-said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 3rd day of July, A. D., 1917.

F. W. H. CLAY, Acting Commissioner of Patents.

It is hereby certified that the name of the patentee in Letters Patent No.

913,679, granted March 2, 1909, for an improvement in Wood-Pulp and Processes for Making Same, was erroneously written and printed as Carl Baohe-Wiig, Whereas said name should have been written and printed as Carl Bache- Whig and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 3rd day of July, A. D., 1917.

F. W. H. CLAY,

Ading C'mnmiesio'ner of Patents.

[sun] 

